Armature



Dec; 4- v 1,519,861

c. A. MQELDOWNEY ARMATURE Filed Mar ch 4, 1922 TOR IHVEH C 2 BY 4' W L %TTORHEYS.

Patented Dec, 16, 1924. i

UNITED STATES PATENT OFFICE.

CLARENCE A. MOELDOWNEY, OF JACKSON, MICHIGAN, ASSIGNOR TO SPARKS WITHINGTON COMPANY,- OF CLEVELAND, OHIO, A CORPORATION. OF OHIO.

ARMATURE.

. Application filed March 4, 1922. Serial No. 541,105.

mounted thereon, with "the wiring positioned in the slots of said laminations, it is usual to place insulation in the slots to separate the wire from the laminated metallic structure. As the slots are usually enlariged inwardly, the labor of inserting the insu ating sheet or material has ordinarily been done by hand, and requires considerable time and care, and is further not always satisfactory from an efficienc standpoint,

The object, therefore, of the present invention is to avoid the unsatisfactory features of'the former construction while reducing the labor cost of production of the army;

' ture.

Other objects and advantages relate to the details of form, construction and arrangement, of the parts, all as will more fully appear from the following description, taken in connection with the accompanying drawin s, in which .igure 1 is a longitudinal view partially in section of an armature of my lnvention.

Figure 2 is a lateral sectional View of the same at one side of any one of the steel 1aminations or plates.

The invention is here illustrated in connection with an armature shaft 1 with the usual commutator '2 mounted thereon. Upon the armature shaft ismounted the usual laminated structure 3 consisting of a series of metallic or steel plates 3,ieach lamination or plate being provided with a plurality of slots4- at its edge. These slots are preferably enlarged at their inner portions in substantially circular form, as indicated at 5. The slots in each of the steel plates or laminations, when the latter are assembled register to form longitudinal passageways lengthwise of the armature for the reception of wiring,

as shown. The particular and specific feature of this invention consists in spacing certain of these steel plates or laminations 3- by, means of similarly formed and shaped sheets -7 of insulating material, such as fibre or the like. Preferably these fibre sheets -7 have axial openings similar to the openings thru' the laminations 3 and are mounted upon the shaft in concentric relation with the laminations. Any suitable number of these insulating disks 7- may be used, as for instance, a disk after each two or four laminations 3- or any other suitable arrangement may be made in accordance with the necessities of the case and the particular use to which the armature is to be applied, and its size. Preferably these disks 7- are substantially the same diameter as the laminations 3. Each of the insulating disks -7 has a number of slots, or openings 6 conforming to and registering with the slots in the laminations -3 the dis tinctive feature being that the slot when punched inthe fibre disk is of slightly less "size than the slot punched in the lamination, so that when brought into substantial registration therewith, the edge 8 of the insulating disk 7 projects into the longitudinal passageway formed by the registering slots 5 in laminated steel sheets 3-. The difference in diameter between the enlarged portions 5 of the openings in the laminations 3'-, as indicated, and the openings in the insulating sheet bordered by edge 8- need not be very great, but

simply of sufficient amount so asto space wires passing through the aligned slots in the laminations from contactwith such laminations -3 so as to electrically insulate the wires from the steel laminations of the armature.

As shown, the portions -'5 of the slots in the laminations 3 and the inner portions of the slots 6 in the disk 7 are substantially circular, the diameter of the portions of the slots in the fibrous disk -7 bordered by edge 8 being slightly less than the diameter of the slot portions -5, thereby forming a series of spaced insulat ing rings within and obstructin the passageway formed by the aligned s ots in the laminations 3- and the Wires contained. therein bear against the edges -8,*bordering the slots in the disks 7 and are spaced from the edge of the slot portions The winding may be effected in the usual manner, through the 'slots,.without the necessity of placing in the slots any insulating sheet or other material to insulate the wiring from the laminated structure for the reason that the projections of the fibre sheets effect that result. ufacture can be carried on in the usual manner-the only distinction being that when the laminations 3 are being mounted on the shaft 1 an insulating disk should be placed at properly spaced intervals along the shaft to separate the disks to produce a structure of the required character.

Altho I have shown and described a specific structure as illustrative of my invention, I do not desire to limit myself to the details of form, arrangement or construction of the same, as various changes may be made in the details of each without departing from the invention, as set forth in the appended claims.

I claim:

1. An armature comprising a pair of metallic laminations having aligned edge slots therein and an insulating disk interposed between the laminations and having edge slots aligned with and of less area than the slots in the laminations.

2. An armature comprising a series of metallic disks having aligned slots forming apassageway extending longitudinally of the armature and spaced insulating disks having portions projecting into said passageway.

3. A built-up armature comprising a plurality of metallic laminations having alignededge slots therein forming a passageway extending longitudinally of the armature, an insulating disk at each end of the armature and one or more insulating disks interposed between laminations, all of said insulating disks having edge slots aligned with and. of less area than the slots in the laminations, and wiring positioned in the passageway which extends longitudinally of the armature and spaced from the metallic laminations by said insulating disks.

4. An armature comprising a shaft a. series of metallic disks mounted on and formed with an opening fitting the shaft and having registering slots forming a passageway extending longitudinally of the armature, and spaced insulating members haying portions projecting into said The ordinary man-v 'sageway and constricting the circumference" thereof.

An armature comprising a series of metallic disks having registering slots formmg a passageway extending longitudinally of the armature, an insulating disk interposed between two of said metallic disks and having a slot registering with and of less area than the aligned slots in said metallic disks, and wiring in said passageway spaced from the metallic disks by the edge of said insulating disk.

6., In an armature, a shaft, a built-up core mounted on the shaft and comprising a series of metallic disks mounted on the shaft to rotate therewith, and having registering openings forming continuous passageways extending longitudinally of the armaturc, wiring in said passageways, insulating disks mounted on said shaft at opposite ends of the metallic disks and having openings registering with the continuous passageways and one or more intermediate insulating disks clamped tightly between two of the metallic disks and having openings registering with the continuous passageway, but with portions projectin into the passageway whereby the insu atin disks serve to space the wiring in said continuous passageways from the metallic disks.

7. In an armature, a shaft, a built-up core mounted on the shaft and comprising a series of metallic disks mounted on the shaft to rotate therewith and having registering openings forming continuous passageways extending longitudinally of the armature, wiring in said passageways, insulating disks mounted on said shaft at opposite ends of the metallic disks and having openings registering with the continuous passageway,

but with portions projecting into the passageways and constricting the area thereof, and one or more intermediate insulating disks clamped tightly between two of the metallic disks and having openings registering with the continuous passageway, but with portions projecting into the passageway whereby the insulating disks serve to space the wiring in said continuous passage ways from the metallic disks.

In witness whereof I have hereunto set my hand this 27th day of February 1922. CLARENCE A. MGELDO'WNEY. Witnesses:

H. M. JOHNSTON, LILLIAN E. WUNnnnnrorr. 

